You are falling for the illusion behind mastery.
No matter what the mastery is, it’s function is the same, to funnel you into a singular fighting form. It is simply not an interesting stat regardless of which way you put it because of this.
What i mean is, for example i cannot have physical talent as a frost dk because any frost ability or ability that indirectly buffs frost output will simply out-scale it unless that ability is made obscenely op to the point mastery itself is then useless.
It has always had this problem, why do you think the interesting blood and unholy talents were removed from frost? because mastery would not allow them to exist effectively within the spec.